Electronic modules having integrated lever-activated latching mechanisms

ABSTRACT

An integrated latching mechanism for use with a user pluggable electronic module, such as an opto-electronic transceiver module, is disclosed. The latching mechanism allows the user to selectively latch the module within a corresponding host port by manipulation of a pivot lever. Movement of the pivot lever causes a locking pin to extend and latch the module within the port. Conversely, movement of the pivot lever can disengage the locking pin and thereby allow the user to extract the module from within the port. The pivot lever can further include a biasing member that biases the pivot lever in a locked position.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.10/776,430, filed on Feb. 11, 2004, which is a continuation-in-part ofU.S. patent application Ser. No. 10/389,509, filed on Mar. 14, 2003, nowU.S. Pat. No. 7,066,746, which is a continuation of U.S. patentapplication Ser. No. 10/075,835, filed Feb. 12, 2002, now U.S. Pat. No.6,533,603, which is a continuation-in-part of application Ser. No.09/971,885, filed Oct. 4, 2001, now U.S. Pat. No. 6,439,918, all ofwhich are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. The Field of the Invention

This invention relates generally to the field of electrical connectorsystems for electrical components. In particular, embodiments of thepresent invention relate to a latching system that is particularlyuseful in low profile, user-removable, electronic modules that interfacewith a port of a host device. For example, embodiments of the presentinvention may find particular use with transceiver modules used tointerface a host device with a data communications network.

2. The Relevant Technology

Fiber optics are increasingly used for transmitting voice and datasignals. As a transmission medium, light provides a number of advantagesover traditional electrical communication techniques. For example, lightsignals allow for extremely high transmission rates and very highbandwidth capabilities. Also, light signals are resistant toelectro-magnetic interferences that would otherwise interfere withelectrical signals. Light also provides a more secure signal because itdoesn't allow portions of the signal to escape from the fiber opticcable as can occur with electrical signals in wire-based systems. Lightalso can be conducted over greater distances without the signal losstypically associated with electrical signals on copper wire.

While optical communications provide a number of advantages, the use oflight as a transmission medium presents a number of implementationchallenges. In particular, the data carried by a light signal must beconverted to an electrical format when received by a device, such as anetwork switch. Conversely, when data is transmitted to the opticalnetwork, it must be converted from an electronic signal to a lightsignal. A number of protocols define the conversion of electricalsignals to optical signals and transmission of those optical, includingthe ANSI Fiber Channel (FC) protocol. The FC protocol is typicallyimplemented using a transceiver module at both ends of a fiber opticcable. Each transceiver module typically contains a laser transmittercircuit capable of converting electrical signals to optical signals, andan optical receiver capable of converting received optical signals backinto electrical signals.

Typically, a transceiver module is electrically interfaced with a hostdevice—such as a host computer, switching hub, network router, switchbox, computer I/O and the like—via a compatible connection port.Moreover, in some applications, it is desirable to miniaturize thephysical size of the transceiver module to increase the port density,i.e., to accommodate a higher number of network connections within agiven physical space. In addition, in many applications, it is desirablefor the module to be hot-pluggable, which permits the module to beinserted and removed from the host system without removing electricalpower. To accomplish many of these objectives, international andindustry standards have been adopted that define the physical size andshape of optical transceiver modules to ensure compatibility betweendifferent manufacturers. For example, in 1998, a group of opticalmanufacturers developed a set of standards for optical transceivermodules called the Small Form-factor Pluggable (“SFP”) TransceiverMultiSource Agreement (“MSA”). In addition to the details of theelectrical interface, this standard defines the physical size and shapefor the SFP transceiver modules, and the corresponding host port, so asto insure interoperability between different manufacturers' products.The standard also specifies that the module be hot-pluggable. To do so,the standard specifies that a user provide a minimum amount of spacebetween host ports, so that transceiver modules can be individuallyaccessed and removed from the host device without disturbing theadjacent modules and/or cable connections.

While such standards may recommend that there be a minimum distancebetween adjacent ports, there is often a desire to provideconfigurations having a higher port density. However, providing a highport density can be at odds with the ability to provide a module thatcomplies with existing standards—i.e., that has a small form-factor andis hot-pluggable. In particular, previously existing module designspresent a size and profile that mandates that a specific minimum amountof space be provided between host ports so that individual modules canbe accessed and removed without disturbing an adjacent module and/or anadjacent fiber cable. Such modules either cannot be used in a devicehaving a high port density (due to the space requirements), or, if usedin such an environment, require the use of a special extraction tool toallow for access and retrieval of a module without disturbing adjacentmodules and/or cables. Use of an extraction tool is often not desirablebecause it raises costs, the tool can be misplaced, and/or it may not becompatible with other module designs.

BRIEF SUMMARY OF THE INVENTION

These and other problems in the prior art are addressed by embodimentsof the present invention, which relate to an electronic/opto-electronic,pluggable module that is equipped with a unique latching mechanism. Inan illustrated embodiment, the module is an opto-electronic transceivermodule, typically used to interface an optical transmission cable mediumto a host device, such as a network switch, hub, router, computer or thelike. In an alternate embodiment, the module is an electronic modulethat interfaces with a copper or another electrically conductivetransmission medium.

In one exemplary embodiment, the module is formed as a small form-factorpluggable (“SFP”) device in accordance with existing industry standards.Moreover, the module is capable of being operatively received within acompatible port provided by the host device. It will be appreciated thatwhile exemplary embodiments are illustrated and described as atransceiver module, the present invention is not limited to thatparticular environment. Indeed, teachings of the present invention couldalso be utilized in any type of pluggable electronic module.

In an exemplary embodiment, the module includes a base portion thatsupports a printed circuit board (PCB) upon which are disposed theelectronics needed to ensure the functionality of the module. Inaddition, the PCB has an edge connector formed at one end that iscapable of electrically interfacing with the host device when the moduleis operatively received within the device port. Also disposed on one endof the base portion is at least one receptacle capable of physicallyreceiving and interfacing with a corresponding optical fiber connector,which in turn is connected to a fiber optic cable. Alternately, astandard wire jack, such as an RJ-45 connector, can be used. In analternative exemplary embodiment, an outer housing encloses at least aportion of the base and the PCB to protect the electronic and opticalcomponents from dust and the like. Moreover, the housing defines anouter periphery that conforms in size and shape to the correspondinghost port. The size and shape can correspond to specifications definedby the MSA standard. Of course, other shapes and sizes could be used.

In illustrated embodiments, the module includes an integrated latchingmechanism that provides several preferred functions. In particular, thelatch mechanism provides the ability to releasably secure thetransceiver module within the host port. Moreover, the latch mechanismcan be implemented within a transceiver module having a SFP package,which can be done with mechanical dimensions that are substantiallysimilar to industry standards. The latch mechanism permits easyextraction and insertion of the module by a user, even when it is usedin a host device having a high-density port configuration—both laterallyand vertically. Further, extraction can be accomplished without the useof a specialized extraction tool, and without disturbing adjacentmodules and/or cables.

In one exemplary embodiment of the present invention, the latchmechanism is operated by way of a movable pivot lever. The pivot leveris movable between two positions, which in turn dictate the position ofa locking pin. When placed in a latched position, the locking pinextends from the module and engages with a corresponding recess withinthe host port. In this position the module is latched and secured withinthe port. When the pivot lever is moved to an unlatched position, thelocking pin is disengaged from the locking recess, which permits themodule to be extracted from the port. In one exemplary embodiment, thepivot lever is biased in the latched position. This biasing force mustbe overcome to move the pivot lever to the unlatched position. The pivotlever is manipulated by a user who depresses or exerts force on a freeend of the pivot lever typically using a finger or thumb. The pivotlever is positioned at or near a frontal plane of the module and isaccessible by the user without disturbing any adjacent components orstructures. The pivot lever permits the latch to be operated withoutextending the form factor of the module. The modules as designedsubstantially comply with the relevant standards. In particular, thedesign of the pivot lever does not increase the form factor or reducethe density of modules that can be used in a host device.

Thus, the latches of the invention enable modules, such as opticaltransceiver modules, to utilize a latching scheme that allows the moduleto substantially maintain its small form factor to substantially complywith existing standards. At the same time, the latching scheme allowsthe module to be easily inserted and extracted from a port without theneed for a special extraction tool. Moreover, extraction can beperformed in a manner that does not disturb the communications link ofadjacent modules. In other words, extraction can be achieved withoutinadvertently removing an adjacent module and/or fiber cable, even in ahost having high port density.

These and other features of the present invention will become more fullyapparent from the following description and appended claims, or may belearned by the practice of the invention as set forth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

To further clarify the above and other advantages and features of thepresent invention, a more particular description of the invention willbe rendered by reference to specific embodiments thereof which areillustrated in the appended drawings. It is appreciated that thesedrawings depict only typical embodiments of the invention and aretherefore not to be considered limiting of its scope. The invention willbe described and explained with additional specificity and detailthrough the use of the accompanying drawings in which:

FIG. 1 illustrates an exploded perspective view of one exemplaryembodiment of a transceiver module having an integrated latch system;

FIG. 1A is a perspective view of the bottom side of the pivot blockportion of the latch system of FIG. 1;

FIG. 2 is a perspective view of an assembled version of the transceivermodule and latch system shown in FIG. 1 and a corresponding exemplarymodular fiber cable connector and fiber cable assembly;

FIG. 3 a is a cross sectional view of the transceiver module taken alonglines 3-3 in FIG. 2 that shows a latch system in the latched position;

FIG. 3 b is a cross sectional view of the transceiver module taken alonglines 3-3 in FIG. 2 that shows a latch system in the unlatched position;

FIG. 4 is a side view of two adjacent transceiver modules withcorresponding latch systems in different operational positions;

FIG. 5 is an exploded perspective view of another exemplary embodimentof a transceiver module having an integrated latch system; and

FIG. 6 is a perspective view of an assembled version of the transceivermodule and latch system shown in FIG. 5;

FIG. 7 is an exploded perspective view of yet another exemplaryembodiment of a transceiver module having an integrated latch system;and

FIG. 8 is a cross sectional view of the transceiver module taken alonglines 8-8 in FIG. 7 that shows a close-up view of the latch system inthe latched position.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

Reference will now be made to the drawings to describe presentlypreferred embodiments of the invention. It is to be understood that thedrawings are diagrammatic and schematic representations of the presentlypreferred embodiments, and are not limiting of the present invention,nor are they necessarily drawn to scale.

In general, the present invention relates to an electronic module, suchas an optical transceiver module, that utilizes a unique integratedlatch system to releasably secure the transceiver module within a hostslot or port. Moreover, the latch system can be implemented within atransceiver module having a low profile. The module substantiallycomplies with existing industry standards, such as those specified inthe SFP Transceiver MSA. The latch system permits easy extraction andinsertion of the module by a user, even when it is used in a host systemhaving a high-density port configuration, i.e., when the modules aredisposed in ports immediately adjacent to one another in one or bothlateral dimensions. Further, extraction can be accomplished without theuse of a specialized extraction tool, and can be done without disturbingadjacent modules and cables.

Also, while embodiments of the present invention are described in thecontext of optical transceiver modules used in the field of opticalnetworking, it will be appreciated that the teachings of the presentinvention are applicable to other applications as well. For example,other types of pluggable electronic modules, both electronic andopto-electronic, could utilize embodiments of the latch system tofacilitate insertion and extraction from a corresponding host port.

FIGS. 1-6 and the accompanying text relate to a latching mechanism thatuses a bail to enable the user to manipulate the latch. FIGS. 7 and 8and the accompanying text relate to another latching mechanism that doesnot include a bail and is manipulated by users who directly exert forceon a lever, typically with a thumb or finger. While both of theseembodiments are illustrated, the principles associated with the bailembodiment of FIGS. 1-6 are generally also applicable to the embodimentof FIGS. 7 and 8 that does not include a bail. In addition, theembodiment of FIGS. 7 and 8 provides the additional benefit of furtherreducing the space requirements associated with the latching mechanism.

I. Embodiments Using Bail to Manipulate Latching Mechanism

Reference is first made to FIGS. 1 and 2 together, which illustrateperspective views of one exemplary embodiment of an optical transceivermodule, designated generally at 100. In the illustrated example, themodule 100 is comprised of an elongate base portion, designatedgenerally at 102, that is configured to support and retain a printedcircuit board 104. In this example, the circuit board accommodates thetransceiver electronics 103 and optics (not shown), although it could becomprised of any circuitry or components depending on the type of modulebeing used. Also formed on the printed circuit board 104 at a rear endis an exposed edge connector 105. The edge connector 105 is configuredto be electrically compatible with a corresponding electrical connector(not shown) that is positioned within the port of a host device. Otherconnector schemes that are well known in the art could also be used.

In the illustrated embodiment, a connector portion, designated generallyat 106, is positioned at one end of the base portion 102. The connectorportion 106 defines a receptacle configuration 113 that operativelyreceives a corresponding modular fiber connector configuration, such asis typically used to interface with an optical fiber cable. One exampleof such a fiber connector and cable configuration is shown at 150 inFIG. 2. Alternately, a wired cable could be used in a similar module inplace of the optical fiber cable. It will be appreciated that thereceptacle could be implemented to accommodate any one of a number ofdifferent connector configurations, depending on the particularapplication involved.

As is further shown in FIGS. 1 and 2, the module 100 further includes alatching mechanism, designated generally at 101. In one exemplaryembodiment, the latch mechanism 101 provides several functions. First,the latch mechanism 101 provides a mechanism for “latching” the module100 within a host port, represented at 200 in FIGS. 3A and 3B, when themodule 100 is operatively received within the port 200. Moreover, aswill also be described in further detail, the latch mechanism 101 alsoprovides a convenient means for extracting the module 100 from the port200, without the need for a special extraction tool. The latchingmechanism is preferably implemented so as to substantially preserve thesmall form factor of the module 100 in accordance with prevailingstandards, and in a manner that allows convenient insertion andextraction of a single module without disturbing adjacent modules oradjacent fiber cables—even when used in a host having a high portdensity. Also, in an exemplary embodiment, the latch mechanism precludesinadvertent extraction of the module 100 from the port when a modularfiber connector 150 is operatively received within the receptacle 113.

By way of example and not limitation, in an exemplary embodiment, thelatch mechanism 101 includes user accessible means for selectivelylatching the module 100 within a host port, and for extracting themodule from the port. By way of example and not limitation, useraccessible means can be comprised of a bail, designated generally at108. Preferably, the bail 108 has a main body portion 130 formed from arigid metal wire. While the bail 108 could be configured in any one of anumber of shapes, in a preferred embodiment the bail 108 is sized andshaped so as to be accessible with a user's finger, or any other commonimplement, such as a pen or the like. Also, the bail 108 is shaped so asto conform substantially with the shape of the module 100 when the bailis placed in a “latched” position, as is represented in FIG. 2. In thisway, the bail does not violate the overall low profile presented by themodule 100. Also, in one embodiment, the bail 108 includes a grip orclasp 109 that is formed of a material that allows for easier access andgripping by a user's finger. The clasp 109 can be formed any number ofways, including a cylindrical piece that slides over the bail wire, oralternatively, it could be formed by using an overmold process.

In a preferred embodiment, the bail 108 includes a cam 107 thatfacilitates the latching and unlatching of the module within the port.FIG. 1 illustrates how the cam 107 is provided with a bend formed alonga portion of the main body of the bail 108 between two shoulder portions125 and 126. It will be appreciated that the cam could be implementedalong the length of the bail 108 using other techniques. Operation ofthe bail 108 and cam 107 will be discussed in further detail below.

Making continued reference to FIGS. 1, 1A and 2, formed along the topsurface of the connector portion 106 is a retention mechanism foroperatively receiving the bail 108. In the embodiment illustrated inFIG. 1, the retention mechanism is comprised of dual retention slots 127and 128 that are each sized and shaped to receive the correspondingshoulder portions 125, 126 of the bail 108 when the latching system 101is assembled. In operation of the latching mechanism 101, the retentionslots 127, 128 permit rotation of the bail at the shoulder portions 125,126. Of course, the retention mechanism could be implemented in a numberof different ways. For example, a single retention slot may suffice, ordifferent geometries could be used.

In the illustrated embodiment, the bail 108 is operatively secured tothe module 100 by way of an overlying pivot block, designated generallyat 110. FIGS. 1 and 1A show how the pivot block 110 includes a pivotrecess 115 that accommodates the shoulder portions 125, 126 and the camportion 107 when the pivot block 110 is disposed on the top surface ofthe connector block 106 between the retention slots 127 and 128. As isshown in FIG. 1A, which illustrates the bottom of the pivot block 110,the pivot recess 115 preferably includes an enlarged portion 117 that iscapable of operatively accommodating the cam portion 107 when the cam107 is disposed in a horizontal orientation within the enlarged portion117. Again, the pivot recess 115 and the enlarged portion 117 secure thebail 108 to the module 100 in cooperation with the retention slots 127and 128, but do so in a manner so as to permit rotation of the bail 108during operation of the latching mechanism. Rotation of the bail 108causes the cam portion 107 to operatively engage a cam follower surface119 formed on the pivot block 110 within portion 117. This is discussedfurther below.

FIGS. 1 and 1A illustrate how the pivot block 110 also includes a pivotarm 112 disposed along a pivot axis of the block 110. When mounted onthe top surface of the connector portion 106 of base 102, each end ofthe pivot arm 112 is rotatably held within pivot points 122 and 123 thatare each formed on the top surface of the connector portion 106. In anexemplary embodiment, the latching mechanism further includes means forlatching the module 100 within a port slot. This latching means isprovided by way of a lock pin 111 formed along the top surface of apivot end of the block 110. The pin 111 is preferably formed as a wedgehaving a leading edge 211 (FIG. 3A) that is sloped or otherwiseappropriately shaped, so as to facilitate insertion of the module 100into the host port.

FIGS. 1 and 2 also illustrate how the base portion 102 and the printedcircuit board 104 are at least partially enclosed and retained within anouter housing, designated generally at 116. The outer housing 116 isgenerally rectangular in cross-sectional shape so as to accommodate thebase portion 102. The housing 116 includes an opening at its rear end soas to expose the edge connector 105 and thereby permit it to beoperatively received within a corresponding electrical connector slot(not shown) within the host port 200. The housing 116 can be formed ofany appropriate material and in one exemplary embodiment is made ofsheet metal.

In an exemplary embodiment, the housing 116 is also configured so as toprovide a portion of the module's latching mechanism 101. For example,the top surface of the housing includes a locking recess 132, which issized and shaped to expose the lock pin 111 of the pivot block 110 whenthe latch mechanism is in a latched position, as will be describedbelow. Also, the housing 116 includes a means for biasing the latchingmechanism to a latched position. By way of example, in one exemplaryembodiment, the biasing means is a resilient metal portion of thehousing that is formed as a leaf spring 118. When assembled (FIG. 2),the leaf spring 118 is biased against the top surface of the pivot block110 so as to operatively secure it in its assembled position. Also, thebiasing action is applied so as to urge the pivot block 110 in arotational direction about pivot point 112 so as to expose lock pin 111though locking recess 132. This corresponds to the module being in alatched position.

Reference is next made to FIGS. 3A and 3B, which together illustrate thevarious exemplary operating characteristics of the module 100 and itslatching mechanism 101. As noted, the transceiver module 100 is capableof being operatively received within an appropriate port, such as isrepresented at 200 of FIGS. 3A and 3B, of a host system, a portion ofwhich is represented at 202. When operatively received within the port200, the edge connector 105 (FIG. 2) is received within a correspondingelectrical connector (not shown) disposed within the port 200, so as toprovide the requisite electrical interface between the transceivermodule 100 and the host 202. Also, at this point, the modular cableconnector 150 (FIG. 2) of the optical cable 156 can be received withinthe receptacle 113 of the connector portion 106.

In general, the relative position of the bail 108 governs theoperational state of the latching mechanism 101. When placed in alatched position, the module 100 is securely retained within a host port200. In an unlatched position, the module 100 can be removed from thehost port 200. For example, in the latched position, the position of thebail 108 is rotated and placed in a downward direction, as is shown inFIG. 2 and FIG. 3A. Note that the term “downward” is arbitrary, as themodule functions in any spatial orientation within an appropriatelyconfigured port. In this position, the cam portion 107 of the bail 108is horizontally disposed within the enlarged portion 117 of the camfollower surface 119 of the pivot recess 115 and is thus not exertingany cam force against the pivot block 110. As such, the leaf spring 118is biased against the top surface of the pivot block 110 at a point thaturges the pivot block 110 in a rotational direction about pivot point112 so as to expose lock pin 111 though locking recess 132. This lockpin 111 is then able to engage with a corresponding notch or recess 213formed within the port 200 of the host 202. This engagement effectively“latches” the module 100 within the port 202.

In a preferred embodiment, the shape and configuration of the bail 108also allow the cable connector 150 to be received within the modularreceptacle 113 when the bail 108 is placed in this latched position. Asnoted, in this position the bail 108 does not violate the small profilepresented by the module 100. To this end, embodiments may include anover center lock, or nub 209, provided on a lower edge of the connectorportion 106. When placed in the latched position, the clasp 109 snapsover the nub 209 and is retained in that position until disengaged bythe user.

The bail 108 is rotated upwardly, as is indicated by the directionalarrow in FIG. 3A, to place the latch mechanism 101 into an “unlatched”position, shown in FIG. 3B. Note that this upward rotation of the bail108 sweeps out an imaginary pie piece-shaped volume 210, which is seenedge-on in FIG. 3B. When the bail 108 is rotated upwardly, the camportion 107 is rotated to a vertical orientation within enlarged recessportion 117. Because the height of the recess portion 117 is less thanthat of the vertically extended cam, rotation of the cam 107 exerts anupward force on the cam follower surface 119 of the pivot block 110formed within the recess portion 117. The force of the cam 107 againstthe cam follower surface 119 provided on the pivot block overcomes thebiasing action provided by the leaf spring 118 and causes the pivotblock 110 to pivot in the opposite direction about axis 112. This lowersthe pivot lock pin 111 so that it is disengaged from the notch 213formed within the host port 200. In this unlatched state, the user, bypulling on the lever formed by the bail 108, can remove the module 100from the port, as is represented in FIG. 3B. Since the bail 108 extendsout in front of the module 100, extraction can be accomplished withouthaving to grip the sides of the module, and without disturbing and/orotherwise inadvertently affecting the connection status of an adjacentmodule or fiber cable. Also, the shape and configuration of the bail 108insures that it cannot be rotated to the unlatched position while aconnector 150 is disposed within the modular receptacle 113. Thisprevents accidental removal of the module 100 from the port byinadvertently pulling on the connector 150 or cable 156.

FIG. 4 illustrates a profile view of two immediately adjacenttransceiver modules, placed in what is sometimes referred to as a“belly-to-belly” configuration. This might correspond to a portconfiguration in a host device having a high port density. The disclosedlatching mechanism allows this physical orientation and still permitsretraction of one module without disturbing an adjacent module, or thecable of an adjacent module. As is shown, the bail 108 in the uppermodule can be rotated to an unlatched position so as to permitextraction of that module or the cable of an adjacent module. The bottommodule remains in the latched position, and neither it or the cable (notshown) within its receptacle is disturbed by the extraction of the uppermodule.

The following description of alternative exemplary embodiments, showngenerally in FIGS. 5-8, focuses on the various features and enhancementsof the optical transceiver module that differ from, or are in additionto those already discussed in connection with the embodiment describedin FIGS. 1-4. As such, only selected differences between the embodimentswill be discussed below, and a description of many of the commoncomponents will not be repeated here. Although for ease of illustrationthe following description focuses on a transceiver module for use invarious fiber optic applications, the concepts discussed are alsoapplicable to other pluggable module implementations that may beemployed in a variety of other applications.

Reference will next be made to FIGS. 5 and 6, which together depictanother alternative embodiment of a transceiver module, designatedgenerally at 300. Transceiver module 300 can be any type ofelectronic/optoelectronic module currently in use. As will be discussed,the embodiment illustrated in these figures includes variousmodifications to the latching mechanism as described in the previousembodiment. As before, the latching mechanism includes a user accessiblemeans for selectively latching the module 300 within a host port.However, in the present embodiment, the user accessible means is a bail,designated generally at 308, that is configured and positioned so as tobe substantially disposed within a cavity that forms the connectorreceptacle portion of the module.

Moreover, as is best seen in FIG. 6, the bail 308 remains substantiallypositioned within this cavity, even as it is selectively rotated fromthe latched to the unlatched positions. This feature further preventsthe bail from inadvertently contacting other objects, such as adjacentmodules, cables, etc., when it is disposed in either the latched orunlatched position, or during its operation. Additionally, thisembodiment still allows for a module 300 having a low profile formfactor. Further, the overall outer profile and periphery of the module300 is substantially contiguous and devoid of discontinuous surfaces.Again, this increases the ease by which the module can be inserted andretracted from a port. Significantly, the module 300 provides thesefeatures and advantages while still substantially conforming to the SFPTransceiver MSA guidelines. Alternatively, the configuration could beused with other module standards as well.

With continued reference to FIGS. 5 and 6, module 300 generally includesan outer housing 316, an elongate base portion 302, a printed circuitboard 304, and a latching mechanism 301 that includes a bail 308. Theouter housing 316 is substantially identical to the housing 116discussed in the previous preferred embodiment. Also as before, the baseportion 302 is configured to support and retain the printed circuitboard 304, which has disposed on its rear end an edge connector 305.

A connector portion 306 is positioned at the front end of the baseportion 302. The connector portion 306 partially defines a cavity,generally designated at 307, that forms a receptacle 313 that is sizedand shaped to operably interface with an optical fiber cable connector.Again, the receptacle 313 could be implemented so as to accommodate anyone of a number of different connector configurations, depending on theparticular application involved. Examples include, but are not limitedto, a Fiber Channel connector and an Infiniband connector. The connectorportion 306 may be implemented as a separate piece that is attached tothe base portion, or it may be formed integrally with the base portion302.

In addition to defining the receptacle 313, the cavity 307 accommodatesthe bail 308 in a manner so that a substantial portion of the bail 308is operatively disposed within the module. For example, in the exemplaryembodiment, the cavity 307 includes side surfaces 309A and 309B. Thedistance between the side surfaces 309A, 309B define a width that isable to accommodate an optical fiber cable connector (or other cableconnector, depending on the application involved) in the receptacleportion 313, and at the same time, accommodate the bail 308. Also, as isshown in FIGS. 5 and 6, the arms 334, 336 of the bail 308 rest withinretention slots—401A and 401B along the bottom of the cavity, and 405Aand 405B along the top of the cavity 307—when the bail is in a latchedor an unlatched position. These retention slots are formed by providinga space between the respective side walls 309A and 309B, and ridgesformed along the bottom (403A and 403B) and top (407A and 407B) of thecavity 307. The retention slots ensure a separation between the bail andthe received cable connector, and also provide a level of structuralstability to the bail within the cavity when it is in a latched orunlatched position.

In the illustrated embodiment of FIGS. 5 and 6, the latching mechanism301 generally includes a pivot block 310, a mounting plate 314, and thebail 308. In the embodiment shown, the pivot block 310 is substantiallysimilar to the pivot block 110 of the previous embodiment, and includesa pivot pin 311, pivot arms 312, and a pivot recess 315.

The mounting plate 314 includes mounting and pivot components for use inoperatively interconnecting the pivot block 310, the bail 308 and themodule 300. For example, the mounting plate 314 includes retention slots327 and 328, as well as pivot points 322 and 323. As is best seen inFIG. 6, the mounting plate 314 is at least partially and operativelyattached to the base 302 via a clip 352 that is substantially disposedabout the outer surface of the base. Preferably, the outer surface ofthe clip 352, when mounted to the module, is substantially contiguouswith the other portions of the module. This ensures a module peripherythat is substantially contiguous and without edges, so that the moduleis easy to insert within a port. When mounted, the mounting plate 314 ispositioned substantially above the receptacle 313. Alternatively, themounting plate 314 could be integrally formed with the connector portion306, for example as is shown in the previously described embodiments.

In the illustrated embodiment, the bail 308 is shaped so as toselectively operate substantially within the cavity 307. As previouslymentioned, this minimizes the extent to which the bail 308 extendsbeyond the front of the module 300, thereby protecting the bail fromdamage or inadvertent contact with other adjacent modules or cables whenit is rotated from its latched or unlatched position. In the illustratedembodiment, the bail 308 includes a main body portion 330 preferablyformed of a rigid metal wire that includes a cam 407 disposed betweenshoulder portions 325 and 326, similar to the previous embodiment. Thebail 308 also includes a lever grip portion 330A suitable for graspingby a user's finger (or similar implement) when the module 300 is removedfrom a host port 200. As is shown, while the majority of the bailremains disposed within the cavity 307, the grip portion 330A remainssubstantially external to the cavity so as to be accessible by a user.

The bail 308 further comprises connecting arms 334 and 336 that extendbetween the lever portion 330A and each of the shoulders 325 and 326.The connecting arms 334 and 336 enable the cam 307 to operate againstthe pivot block 310 and rotate it when the lever portion 330A is movedfrom either the latched or unlatched position. Specific to thisembodiment, each connecting arm 334 and 336 is shaped to enable theabove rotation while remaining substantially disposed within the cavity307. As is seen in FIG. 5, the connecting arms 334 and 336 have firstsegments 334A and 336A, and second segments 334B and 336B that areangled with respect to the first segments. It will be appreciated, ofcourse, that the bail 308 could have differently shaped configurationsin order to provide similar functionality. For example, the bail couldinclude only one connecting arm, if desired.

Particular reference is now made to FIG. 6, which shows the module 300in its assembled configuration. In such a configuration, the shoulderportions 325 and 326 of the bail 308 are operatively disposed within theretention slots 327 and 328 in a manner similar to that described inconnection with the previous embodiment. Moreover, the connecting arms334 and 336 are configured so as to be disposed within the retentionslots defined on either side of the cavity 307 when placed in a latched(slots 401A, 401B) and an unlatched (slots 405A, 405B) position. Theother components included in the latching mechanism 301 are assembledsubstantially as described above in the previous embodiment. Further,operation of the latching mechanism 301—aside from the fact that thebail 308 is substantially disposed within the module—is substantiallysimilar to that of the previous embodiments.

The bail 308 is shown in FIG. 6 in its latched position; that is, it ispositioned such that the pivot pin 311 is exposed through a lockingrecess 332 in the outer housing 316 to engage the recess 213 in the hostport 200 (FIG. 3A). In this position, the receptacle 313 is able toreceive the connector of an optical fiber cable for connection with themodule 300. As with the previous embodiment, once a fiber cable isconnected to the module 300 via the receptacle 313, the bail 308 isprevented from rotating to its unlatched position.

FIG. 6 also shows in phantom the unlatched position of the bail 308. Inthis position, as before, the module 300 is able to be retracted fromport 200 of the host device 202. To transfer the bail 308 from thelatched position to the unlatched position in the illustratedembodiment, the fiber cable connector is removed from the receptacle313. Then, a user grasps the lever 330A and rotates the bail 308 towardthe unlatched position. This force causes the connecting arms 334 and336 to translate through the slots defined on either side of the cavity307, which in turn causes the cam to rotate within the pivot recess androtate the pivot block 310. As already explained, rotation of the pivotblock 310 causes the pivot pin 311 to disengage the recess 213 of thehost port 200, thereby enabling the module 300 to be removed from thehost port.

Note that the movement of the connecting arms 334, 336 and the leverportion 330A of the bail 308 when transferred from the latched positionto the unlatched position sweep out an imaginary pie piece-shapedvolume, which is partially depicted at phantom lines 410 in FIG. 6. Incontrast to the volume 210 swept out by the bail 108 in the previousembodiment as shown in FIG. 3B, a substantial portion of the volume 410is contained within the cavity 309 defined by the connector portion 306.This is due to the disposition of the bail 308 in the present embodimentsubstantially within the cavity 307. Significantly, this design enablesrotation of the bail 308 from the latched to the unlatched positionwhile protecting a significant portion of the bail within the module 300such that inadvertent contact between the bail and other objects, suchas cables attached to other adjacent modules, is prevented. This, inturn, helps ensure that movement of the bail from either the latched orthe unlatched position is unimpeded such that removal of the module fromthe port of the host device is accomplished at will. Finally, the abovefunctionality is implemented so as to preserve the desired small formfactor of the module in accordance with prevailing standards.

II. Embodiments Using a Pivot Lever to Manipulate Latching Mechanism

Reference is now made to FIGS. 7 and 8, which show another alternateexemplary embodiment of the present invention, designated generally asreference numeral 700. As will be discussed, the embodiment illustratedin these figures includes various modifications to the latchingmechanism as described in the previous embodiment. As before, thelatching mechanism includes a user accessible means for selectivelylatching the module 700 within a host port. However, in the presentembodiment, the bail is not present. Other than the absence of the bail,the principles described above in reference to FIGS. 1-6 are generallyapplicable to this embodiment.

The user accessible means is a pivot lever, designated generally at 710.Pivot lever 710 is an extension of the pivot block shown in previousembodiments. Extending the length of the pivot lever 710 beyond a frontplane of the module 700 allows a user to unlatch the module 700 withoutthe need for the external bail. A user can simply apply slight upwardpressure to a leading edge 712 of the pivot lever 710, pivoting thepivot lever 710 about the pivot point 112, to release the locking pin111.

Pivot point 112 can be placed at other locations. For example, the pivotpoint 112 can be farther forward or farther towards the rear of themodule 700. Alternately, pivot point 112 can be eliminated entirely, andthe pivot lever 710 can be a cantilevered portion of the module housing.Such a cantilevered pivot lever 710 would also bias the module 700 in alocked position. As with the embodiment described above, a user needonly apply slight downward pressure to the leading edge 712 of the pivotlever 710 to unlatch the module 700, thus making it easy to remove.

Pivot lever 710 is similar in size, external dimensions, and structureto pivot blocks 110 and 310. However, since no bail is needed to actuatepivot lever 710, the underlying structure of FIG. 1A, showing the pivotrecess 115, enlarged portion 117, and cam follower surface 119 can beeliminated if desired. The pivot lever 710 functions properly withoutthese structures being present on its underside. Alternately, to savemanufacturing time, the pivot recess 115, enlarged portion 117, and camfollower surface 119 can be left in place. This will not affect thefunction of the pivot lever 710. The lock pin 111 remains on the pivotlever 710, thus allowing the module 700 to be locked in place inside theport 200.

In one exemplary embodiment, the pivot lever 710 is extended toapproximately 0.07 of an inch longer than corresponding pivot blocks 110and 310. This amount of extension allows the pivot lever 710 to beeasily manipulated by, for example, the finger of a user or otherimplement, while avoiding the possibility of inadvertent release. Oneadvantage of this embodiment is that it prevents inadvertent release ofthe module 700 when a fiber optic cable is inserted into the module 700,since a user would be unable to insert a finger under the pivot lever710 to lift it up when a fiber optic cable is present. Additionally,this amount of an extension allows the module 700 to be easily removedfrom a port. A user need only release the locking mechanism, grasp thelever, and gently slide the module 700 out of the port. One skilled inthe art will realize that smaller or larger extensions are possible.Such smaller and larger extensions are contemplated as being within thescope of the present invention.

According to one embodiment of the module of FIGS. 7 and 8, the movablepivot lever, when moved during disengagement of the module from withinthe host port, does not extend below a bottom plane defined by a bottomsurface of the outer housing 116 of the module. In FIG. 8, this bottomsurface of the outer housing 116 is the surface opposite the top side ofthe module where lock pin 111 engages with recess 213 formed within thehost port. This allows the latching mechanism to be employed withoutincreasing the profile of the module and without interfering with othercomponents or structures that might be vertically adjacent to the modulewhen the module is used in a host device.

Since the bail is not present, it cannot inadvertently contact otherobjects, such as adjacent modules, cables, etc. Additionally, thisembodiment still allows for a module 700 having a low profile formfactor. Further, the overall outer profile and periphery of the module700 is substantially contiguous and devoid of discontinuous surfaces.Again, this increases the ease by which the module can be inserted andretracted from a port. Significantly, the module 700 provides thesefeatures and advantages while still substantially conforming to the SFPTransceiver MSA guidelines. Alternatively, the configuration can be usedwith other module standards as well, to include electronic modulesinstead of optoelectronic modules.

To summarize, embodiments of the present invention provide a number ofadvantages over existing pluggable electronic module designs. Thedisclosed electronic module utilizes a unique latching mechanism thatallows the module to be easily extracted from a host port—even inenvironments having a high port density. In particular, the latchingmechanism allows a module to be retrieved from a port without the needfor specialized extraction tools, and in a manner that does not disturbadjacent modules and/or adjacent fiber cables. Moreover, when a cableconnector is operatively received within the port's receptacle, thelatching mechanism insures that the module is latched within the port,and is not extracted by inadvertently pulling on the plug or cable.Finally, the latching mechanism is implemented in a manner so as topreserve the overall low profile presented by the module, as is requiredby existing industry standards.

The present invention may be embodied in other specific forms withoutdeparting from its spirit or essential characteristics. The describedembodiments are to be considered in all respects only as illustrativeand not restrictive. The scope of the invention is, therefore, indicatedby the appended claims rather than by the foregoing description. Allchanges which come within the meaning and range of equivalency of theclaims are to be embraced within their scope.

1. A transceiver module for use in a communications network, the modulecomprising: a cable receptacle that is capable of receiving one or morecable connectors; a movable pivot block rotatably engaged with the cablereceptacle and having a locking member that is configured to selectivelyengage a host port, the pivot block being configured to allow removal ofthe module from within a host port, wherein movement of the pivot blockmanipulates the locking member in a manner so as to disengage the modulefrom within the host port; and a biasing member that biases the moveablepivot block in a locked position.
 2. A transceiver module as defined inclaim 1, wherein the moveable pivot block is shaped so as to prevent themanipulation of the locking member when a fiber optic cable connector isdisposed within the fiber optic cable receptacle.
 3. A transceivermodule as defined in claim 1, wherein the biasing member is a metalportion of a housing of the transceiver module that is formed as a leafspring.
 4. A transceiver module as defined in claim 1, wherein thebiasing member is biased against a top surface of the moveable pivotblock so as to operatively secure the moveable pivot block.
 5. Atransceiver module as defined in claim 1, wherein the moveable pivotblock pivots about a pivot point.
 6. A transceiver module as defined inclaim 1, wherein the moveable pivot block is a cantilevered portion of ahousing of the transceiver module.
 7. An optical transceiver modulehaving transceiver electronics and optics to convert optical signalsinto electrical signals or electrical signals into optical signals, themodule comprising: a fiber optic cable receptacle that is capable ofreceiving one or more fiber optic cable connectors; a movable pivotblock rotatably engaged with the cable receptacle and having a lockingmember that is configured to selectively engage a host port, the pivotblock being configured to allow removal of the module from within a hostport, wherein movement of the pivot block manipulates the locking memberin a manner so as disengage the module from within the host port; and abiasing member that biases the moveable pivot block in a latchedposition.
 8. An optical transceiver module as defined in claim 7,wherein the moveable pivot block is shaped so as to prevent themanipulation of the locking member when a fiber optic cable connector isdisposed within the fiber optic cable receptacle.
 9. An opticaltransceiver module as defined in claim 7, wherein the biasing member isa metal portion of a housing of the transceiver module that is formed asa leaf spring.
 10. An optical transceiver module as defined in claim 7,wherein the biasing member is biased against a top surface of themoveable pivot block so as to operatively secure the moveable pivotblock.
 11. An optical transceiver module as defined in claim 7, whereinthe moveable pivot block pivots about a pivot point.
 12. An opticaltransceiver module as defined in claim 7, wherein the moveable pivotblock is a cantilevered portion of a housing of the transceiver module.13. A small form factor pluggable (SFP) fiber optic transceiver modulecomprising: a housing portion containing a printed circuit board havingtransceiver electronics and optics to convert optical signals intoelectrical signals or electrical signals into optical signals; amoveable pivot block, wherein movement of the moveable pivot blockdisengages the module from within a host port and exertion of a pullingforce on the moveable pivot block permits the module to be withdrawnfrom the host port; a locking member, formed on the pivot block, thelocking member configured to selectively engage the module within thehost port, and wherein the locking member is selectively disengaged bymovement of the moveable pivot block by applying a force to a leadingedge portion on the pivot block; and a biasing member that biases themoveable pivot block in a latched position.
 14. A module as defined inclaim 13, wherein the moveable pivot block disengages the module fromwithin the host port by manipulating the pivot block against a biasingforce of a biasing member.
 15. A module as defined in claim 13, whereinthe moveable pivot block is a cantilevered portion of the housing.
 16. Amodule as defined in claim 13, wherein the biasing member is a metalportion of the housing portion that is formed as a leaf spring.
 17. Amodule as defined in claim 13, wherein the biasing member is biasedagainst a top surface of the moveable pivot block so as to operativelysecure the moveable pivot block.
 18. A transceiver module, comprising: ahousing portion; a connector portion attached to the housing portion andconfigured to removably receive one or more cable connectors; a pivotblock including a pivot arm that rotatably engages the connectorportion, the pivot block being rotatable between a first pivot blockposition where the module is latched to a host port, and a second pivotblock position where the module is unlatched from the host port; and abiasing member that biases the moveable pivot block.
 19. The transceivermodule as recited in claim 18, wherein the pivot block includes a pivotarm rotatably engaged with the connector portion.
 20. The transceivermodule as recited in claim 18, wherein the biasing member is a metalportion of the housing portion that is formed as a leaf spring.
 21. Thetransceiver module as recited in claim 18, wherein the pivot block isbiased into the first pivot block position.
 22. The transceiver moduleas recited in claim 18, wherein the pivot block is positioned on top ofthe connector portion.
 23. The transceiver module as recited in claim18, wherein the biasing member is biased against a top surface of thepivot block so as to operatively secure the moveable pivot block.